1. A Path Toward Standardized Low-Energy Emittance Measurements Doug Moehs January 17, 2007

2. Doug Moehs2 Outline LARP Mission and Interests LARP Mission and Interests Motivation Motivation Emittance Problem Emittance Problem Possible Solution Possible Solution Allison scanner Allison scanner SCUBEX SCUBEX Conceptual Outline Conceptual Outline Conclusions Conclusions

3. January 17, 2007Doug Moehs3 LARP Mission and Interests Involve US laboratories in LHC upgrades Involve US laboratories in LHC upgrades LHC upgrade plan: Utilize H - beams!!! LHC upgrade plan: Utilize H - beams!!! (http://paf.web.cern.ch/paf/Presentations/PAF_report_ABMB_22May2006.pdf) (http://paf.web.cern.ch/paf/Presentations/PAF_report_ABMB_22May2006.pdf) Priority 1: H - source development Priority 1: H - source development Priority 2: Linac4 and SPL construction Priority 2: Linac4 and SPL construction Develop Accelerator Instrumentation Develop Accelerator Instrumentation Work at the technological frontier Work at the technological frontier Involve young scientists and students Involve young scientists and students

4. January 17, 2007Doug Moehs4 Motivation R. Scrivens, CERN All of the CERN upgrade plans include a new H - Linac! All of the CERN upgrade plans include a new H - Linac! A 3 MeV test stand is now under construction at CERN A 3 MeV test stand is now under construction at CERN This is paralleled by Fermilab's HINS efforts This is paralleled by Fermilab's HINS efforts

5. January 17, 2007Doug Moehs5 Motivation Need Quality low-energy transverse emittance data Need Quality low-energy transverse emittance data CERN has no available emittance probes CERN has no available emittance probes (Thomas Meinschad, CERN Post. Doc. working on the CERN 3 MeV H- front end) Fermilab probes are old and unreliable Fermilab probes are old and unreliable HINS is relying on old data from a different LEBT energy to match to the RFQ HINS is relying on old data from a different LEBT energy to match to the RFQ HINS LEBT-RFQ beam matching B. Mustapha and P. Ostroumov, ANL HINS R&D Meeting, December 14, 2006

6. January 17, 2007Doug Moehs6 Basic Definitions Martin Stockli

7. January 17, 2007Doug Moehs7 Emittance Problem Tough to compare Low- energy emittance values Tough to compare Low- energy emittance values Sensitivity to: Sensitivity to: How they are measured How they are measured Probe type Probe type Double slit Double slit Slit harp Slit harp Pepper pot Pepper pot Where they are measured Where they are measured After source After source After LEBT or MEBT After LEBT or MEBT Analysis method used Analysis method used Thresholding Thresholding Bias subtraction Bias subtraction Eyeballing! Eyeballing! D. Moehs et al., IEEE Trans, Plas. Sci., 33, 1786, 2005

8. January 17, 2007Doug Moehs8 Emittance Problem Impedes: Impedes: ion source selection ion source selection LEBT LEBT simulation simulation Design Design Beam Matching Beam Matching Historical Magnetron Emittances D. Moehs, PNNIB, Sante Fe, Sept. 2006

9. January 17, 2007Doug Moehs9 Possible Solution Create a Standard Candle Create a Standard Candle Establish a “standard” probe type Establish a “standard” probe type Establish a “standard” analysis procedure Establish a “standard” analysis procedure A good place to start A good place to start Follow SNS work (contact: Martin Stockli) Follow SNS work (contact: Martin Stockli) Utilize a highly developed Alision scanner Utilize a highly developed Alision scanner Analysis software called SCUBEX Analysis software called SCUBEX Further testing of this software is needed! Further testing of this software is needed!

10. January 17, 2007Doug Moehs10 Allison Scanner Double slit Double slit Single charge collector Single charge collector X stepping motor stepping motor X’ X’ Electrostatic beam deflection Electrostatic beam deflection Moderate data collection speed Moderate data collection speed Slower than slit- harp Slower than slit- harp Faster than double slit Faster than double slit Some form of this scanner is in use at SNS, LBNL, ORNL(SNS) Picture provided by Martin Stockli

11. January 17, 2007Doug Moehs11 SCUBEEX Self Consistent, Unbiased Exclusion Ellipse EXclusion analysis Excel macro software developed at SNS to compute normalized, RMS emittance Excel macro software developed at SNS to compute normalized, RMS emittance Free but not widely used Free but not widely used Needs additional debugging and testing Needs additional debugging and testing

12. January 17, 2007Doug Moehs12 Conceptual Outline Construct 3 sets of emittance probes including electronics Construct 3 sets of emittance probes including electronics Follow SNS design Follow SNS design Primary users: CERN, Fermilab and SNS Primary users: CERN, Fermilab and SNS Test probes in one location Test probes in one location Write up operating and analysis techniques Write up operating and analysis techniques Disseminate probes and information Disseminate probes and information End result comparable emittance data from primary users End result comparable emittance data from primary users Cost to LARP Cost to LARP 2 sets of emittance probes and electronics 2 sets of emittance probes and electronics Testing and dissemination Testing and dissemination Possible Travel: Possible Travel: Learn about emittance system operation and data analysis program Learn about emittance system operation and data analysis program Installation and data collection at CERN Installation and data collection at CERN

13. January 17, 2007Doug Moehs13 The DESY RF source has been adopted at CERN The DESY RF source has been adopted at CERN The same source is of interest for use on a Proton Driver The same source is of interest for use on a Proton Driver See (Fermilab AAC 2006 summary talk by Hans Weise) See (Fermilab AAC 2006 summary talk by Hans Weise) Informal collaboration partners: Fermilab, CERN, DESY, SNS Informal collaboration partners: Fermilab, CERN, DESY, SNS Other labs expressing interest in good emittance data: LANL, ISIS Other labs expressing interest in good emittance data: LANL, ISIS LaboratoryCurrent(mA)Emittancepi-mm-mr (nor., rms ) PulseLength(ms)Rep.Rate(Hz)LEBTEnergy(keV) SNS upgrade 67 / ~98 0.2 / 0.35 16065 CERN-SPL Phase A / B 40 / 80 0.25 0.4 / 0.7 2 / 50 95 Fermilab-HINS Initial / Final 13 / 40 0.24 3 / 1 2.5 / 10 50 BSNS* Beijing, China 400.20.22575 ISIS upgrade 700.171.55070 Proposed New or Improved Machines Collaborations

14. January 17, 2007Doug Moehs14 Conclusions The goals of this project are consistent with the mission and interests of the LARP collaboration. The goals of this project are consistent with the mission and interests of the LARP collaboration. This project provides timely data for CERN and several US laboratories including Fermilab. This project provides timely data for CERN and several US laboratories including Fermilab.